The Christian world is obsessed with sin!  Many go forth pointing out all the sins of the world and whatever each person is doing...

Did you know that the message of Christianity is not just stop sinning!

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John 17:3  (NIV)

³ Now this is eternal life: that they know you, the only true God, and Jesus Christ, whom you have sent.

So what should you do?

Matthew 6:33New International Version (NIV)

³³ But seek first his kingdom and his righteousness, and all these things will be given to you as well.
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Because once you get you eyes and thought s off yourself and place them upon God  -  all the other things will fall into place! 
Sin is not the problem - your self centerness and personal pride is problem... 

Let's use the Cafeteria model:

Looking at a person who is out living off the streets.  You can say " Why don't you stop dumpster diving? " or " Why don't you get a job?" or  " if you only tried you could get off dope and drugs!".  While all these things are exactly what the homeless person needs  - it generally does not really change their life or existence! 

 But once you show them a better way - like getting them into an elaborate Cafeteria - where they can get all sorts of good foods - then with is available they will not go dumpster diving ...    Because they see there is a better way and choose to turn from their wasted past...  

 *** This is exactly how people will respond once they come to truly know the Lord Jesus in their life because He has done for them what they could never do for themselves.  

" Now this is eternal life: that you might know that you, the only true God, and Jesus Christ whom you have sent."  - John 17:3
This is the whole purpose and goal of the Christian life! 
 Come to Know the Lord Christ in your life! 

 This is how people turn from a sinful life - they choose to do it because they now know and want the better life! So why would you go dumpster diving when you can dine in the finest restaurants?

The only real answer is you would stop dumpster diving (sin) because you now know a much better way!   Who knowing this would return to a pig pen??